John dobney



J. DOBNEY.

ORUTGH (No Modl.)

Y Patented May 20, 1890.

lI i'messes m 7 y WM 26 7- UNITED STATES PATENT OFFICE.

JOHN DOBNEY, OF TORONTO, ONTARIO, CANADA.

VCRUTCFH.

SPECIFICATION formingpart of Letters Patent No. 428,467, dated. May 20,1890.

Application filed January 8, 1890. Serial No. 336,278. (No model.)

To all whom it may concern.-

Be it known that I, JOHN DOBNEY, machinist, of the city of Toronto, inthe county of York, in the Province of Ontario, Canada, have invented acertain new and useful Improvement in Orutches, of which the followingis a specification.

The object of the invention is to devise a simple contrivance by which acrutch provided with a rubber end for use on carpets may be instantlyconverted into a crutch suitable for outside use, where something moreis necessary to secure a firm grip on the ground than an ordinary rubberend, and it consists in the peculiar construction, arrangement, andcombination of parts hereinafter described, and then definitely pointedout in the claims.

In the accompanying drawings, Figure 1 is a perspective view of myimproved crutch. Fig. 2 is an enlarged sectional view of the end of thecrutch, showing the rubber and adjustable rod. Fig. 3 is a sectionaldetail of the metal block and adjustable rod with its spring. Fig. 4 isa plan of the metal block, showing the recesses which form the lock forholding the adjustable rod.

In the drawings, A is the crutch, and B is a rod inserted in the centerof the crutch and having a pointed end a.

O is a rubber block securely held on the end of the crutch by thetapered ferrule D,

which is screwed onto the metal end b of the crutch A.

E is a metal block inserted in the ferrule D immediately below therubber block 0. A flange e, formed 011 the block E, rests upon the metalend 1) of the crutch.

F is a spiral spring placed between the bottom of the metal block E andthe collar'G, fixed to the rod B. The tension of the spring F pushesupwardly and holds the pointed end a of the rod B within the rubberblock C, so that when the crutch is used the pointed end of the rod Bwill not come in contact with the floor.

When the pointed end a is required for use, the rod 13 is pressed downuntil its end 0. projects through the rubber block 0. By this time thelugs f have reached the recess g made in the top of the metal block E.The rod B is then turned so as to bring the said lugs f immediately overthe seats 1;, formed in the recess g, into which they drop. When in thisposition, the Weight on the pointed end a of the rod B is supporteddirectly by the metal block E, which, as shown and described, issecurely held against the metal end of the crutch.

' Then the party using the crutch wishes to dispense with the pointedend a, he has merely to push the rod B until the lugs f are clear oftheir seats 1', and then turn it until the lugs come opposite to theelongated hole in the metal block E, when, by the action of the springF, the rod B is forced up so as to carry its pointed end a within therubber block 0.

That I claim as my invention is 1. The rod B, inserted in the crutch Aand adapted to be turned therein, said crutch having a rubber block Oheld in its end,'in combination with a spring F, lugs f, and recessedblock E, having an oblong hole therein and seats 1' to receive the lugs,substantially as and for the purpose specified,

2. The rod B, inserted in the crutch A and projecting through a holemade in the rubber block 0, which is held in position by the taperedferrule D, in combination with the lugs f, fitting into the recessedmetal block E, a spring F, located between the end of the metal block Eand the collar G, fixed to the rod 13, substantially as and for thepurpose specified.

Toronto, December 24, 1889.

JOHN TDOBNEY.

In presence of CHARLES C. BALDWIN, W. G. McMILLAN.

